Regex validate PIN code

❓ Regex validate PIN code

Q. ATM machines allow 4 or 6 digit PIN codes and PIN codes cannot contain anything but exactly 4 digits or exactly 6 digits.

If the function is passed a valid PIN string, return true, else return false.

Examples (Input --> Output)
"1234" --> true
"12345" --> false
"a234" --> false

✔ Solution

function validatePIN (pin) {
    return /^(\d{4}|\d{6})$/.test(pin);
}